[PATCH] dmaengine: dw: dmamux: Fix build without CONFIG_OF

[Miquel Raynal <miquel.raynal@xxxxxxxxxxx>]

When built without OF support, the match tables are not used and may
produce the following output:
>> drivers/dma/dw/rzn1-dmamux.c:105:34: warning: unused variable 'rzn1_dmac_match' [-Wunused-const-variable]
   static const struct of_device_id rzn1_dmac_match[] = {

One way to silence the warnings is to define the structures with
__maybe_unused.

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
 drivers/dma/dw/rzn1-dmamux.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/dw/rzn1-dmamux.c b/drivers/dma/dw/rzn1-dmamux.c
index 11d254e450b0..45aba783cfbe 100644
--- a/drivers/dma/dw/rzn1-dmamux.c
+++ b/drivers/dma/dw/rzn1-dmamux.c
@@ -102,7 +102,7 @@ static void *rzn1_dmamux_route_allocate(struct of_phandle_args *dma_spec,
 	return ERR_PTR(ret);
 }
 
-static const struct of_device_id rzn1_dmac_match[] = {
+static const struct of_device_id __maybe_unused rzn1_dmac_match[] = {
 	{ .compatible = "renesas,rzn1-dma" },
 	{}
 };
@@ -136,7 +136,7 @@ static int rzn1_dmamux_probe(struct platform_device *pdev)
 				      &dmamux->dmarouter);
 }
 
-static const struct of_device_id rzn1_dmamux_match[] = {
+static const struct of_device_id __maybe_unused rzn1_dmamux_match[] = {
 	{ .compatible = "renesas,rzn1-dmamux" },
 	{}
 };
-- 
2.34.1